Fuel supply unit



oct. 3,- 1939. w. CZARNECK. .2,174,869

`FUEL SUPPLY UNIT 0a. 3, 1939, w CZARNEK. 2,174,869

FUEL SUPPLY y UNIT Fiiled March 26, 1937 5 Sheets-Sheet 4 A mvENToR. Ua/fair C mweck/ Oct. 3, 1939. w. czARNEcKl 2,174,869

FUEL SUPPLY UNIT Filed March 2e, 1957 5 sheets-sheet 5 Patented Oct. 3, 1.939

FUEL SUPPLY Walter Czarnecki, Eddington, Pa., assignor to Ell-- dington Metal Specialty Co., a firm composed of Walter Czarnecki, Sgr., Mary Uzarnecki, Nellie Woisowski, Wesley Oxarnecki, Stanley Czarnecki, Walter V. Czarnecki, Jr., and Casim'er Czarnecki, Eddlngton, Pa.

' Application Moi-cli zo, 1937, sci-inl No. 133,131`

vsv claims (a. los-42) This invention has to do with fuel supply units c which are. employed in conjunction with .oil

burners vfor the purpose of insuring that the uid fuel is delivered to the burner in a properly v in this art to bypass the fluid of excess pressure back to the source of supply. In accordance with the present invention, this uid may be bypassed directly back to the pump, thereby simplifying the installation of the unit, as this bypass back to the showing of Figure 6,

stfrained condition and under a required degree to the pump may be included as a part of the '5 o pressure. s unit, and thus eliminate the usual pipe line back Ordinarily a fuel supply unit of this character to the source of y supply. g includes a. strainer organization, uid pump, and .Various other more detailed objects and ada pressure regulating valve. The strainer or-y vantages which arise in connection with carryl0 ganization strains the fluid fuel coming from the ing out the above noted thoughts in a. practical 10 sourceof supply to deliver the same in a prop- 'embodiment will in part become apparent, and in erly strained condition to the pump. The pump part be hereinafter stated, as thedescription of builds up pressure in the fluid which is passed" the invention proceeds. to the pressure regulating valve, and when a "re- The invention, therefore, comprises a fuel supquired degree of pressure is built up in the uid ply unit for oil burners and the like, which conl. the pressure regulating valve is effective to pass sists of a strainer organization, ,improved fluid -the saine to the oil burner. If an'excess of pl'eS- pump of the rotary type, and an improved pressure in the fluid is built up in the pressure regusure regulating valve, and which strainer orlating valve, this excessive pressure is' regulated ganjzation, pump and pressure regulating valve by a bypass arrangement which bypasses ud are assembled in a novel manner. 12 fuel back to the source 0f supply. An important phase of ,the invention lies in The present invention contemplates followlng the adaptability of assembling the parts of the the more or lessl conventional procedure outlined unit 1n several distinct, manners, so as to acc0m ab0ve, but has in view as an iruwrteutebleet the monate particular conditions of installation. As

bremen 0f a fuel Supply urut 0f thlS type 1n will become apparent from the following descrlp- 25 whlch the Strain-er organization, ulq pump, and tion the pressure regulating valve may be as- Pl'essure regulating Valve are assembled and 'P0' sembled in any one of several dlil'erent positions related in a. novel and improved manner which with respect to the remainder of the unit, and

not only tends fr mproved results m the opera* Y the pressure regulating valve is effectively operso tion of the various elements, but also provides for able in any position in which it may be installed assembmig tliqsame in a' compact mt Wlth m For a full and more complete understanding ofv creased Slmphclty. in the assembly pless'. the invention, reference .may be had to the fol- Yet another object of the present inventlon lies lowing dscription and accompanying drawings. r in the provision of a fuel supply u nlt of the type wherein a6 3J above ngtl" mtwhlcl a' lughly ifimrved ld Figure 1 is a plannview partly irl elevation and glug!) En iert gearocsse Olfs bilne u o u fpartly in section, of a fuel supply unit made in i tleeud p. g p p accordance with the precepts of this invention,

Numerous detailed objects and. features of the Figure 2 is a' side View partly in Sectlon and 40 invention are'tiedup with the provision of the partly in elevation which is taken at'ght angles 40 to the showing of Figure 1. This view is taken gydslilenlasl Whlch Wm be heremabout on the plane represented by the line 2-2 Still another important object of the present 0f E 'lgul'e 1r v i invention is to provide in a fuel supply unit of Fl'gure 3 1S a Qetalled Plan flew 0f One 0f the the character above noted an improved pressure Sti' 91.11161' parts, A. I- u 45 regulating valvewhich is designed particularly Flgure 4 1S a vertical section through the umt with the thought 'of maintaining constant and taken abeut 0n the plane represented bythe line "uniform the pressure at which uid is d elivered 4-4 0f Flglile 1, n i I. to the burner during long periods of service, and Figure .5 ls a side elevational showing of the which pressure regulating valve may also be mcdicatlon, 1n which the bypass goes directly 50 nicely adjusted to vary the pressure at which bach to thepump, c iluidlywillA be bypassed back to the source of y Flgurle 6 lsta detalled plan view of one of the su Y l Pump e elllen S, 8S 1S i gli: above pointed out, it has been the practice Figure 7, which is a View taken at right angles s i sure regulating Avalve per se,

Figure 9 is a plan elevational showing in detail of one of`the pressure regulating valve parts, While Figure 10 is a. side elevational showing taken at right angles to Figure 9,

Figure 11 is a view similar to Figure 9 of a slight modification, While Figure 12 is a sectional view taken at right angles to the showing of Figure 11,

Figure 13 is an enlarged detailed View partly in section and partly in elevation, of a modied valve mechanism which may be employed at the port to the burner, while Figure 14 is a detailed View, also partly in section and partly in elevation, of the valve member per se,

Figure 15 is an enlarged detailed view bringing out the arrangement of blades in the rotor element of the pump, while Figure 16 is a similar view bringing out the disposition of the extremities of the blades and sealthe pressure regulating valve and the remainder of y,the unit in one position,

"Figure 18 is a view similar to Figure. 17 of a similar modication, bringing out the pressure regulating valve in an inverted vertical position,

Figure 19 is another similar showing of this modification, developing the pressure regulating valve in one horizontal position,

Figure 20 is a view similar to Figure 19 of a modified form, bringing out the pressure regulating valve in an inverted horizontal position,

Figure 21 is a sectional showing taken on a plane similar to Figure 4, but of a modied form,

Figure 22 is a plan view, with parts broken away and shown in section of a modication in which the fluid is by-passed back to one of the l strainer chambers,

Figure 23 is an elevational" showing taken at right angles to the plane of Figure 22, with the pressure regulating Valve removed,

Figure 24 is a detailed showing of one of the end rings for the pump modication shown in Figure 25, which is a section taken on a-plane perpendicular to the axis ofthe pump chamber at one end of the rotor. In this view the rotor and blade `structure of the pump are of a modied form, and

Figure 26 is a sectional-showing taken through the axis of the rotor, andof the modication shown in Figure 25.

Referring now to the drawings, wherein like reference characters denote corresponding parts, 'a fuel supply unit is shownas comprising a main body portion designated B, which may be made from any appropriate metal which is machined'to accommodate the various mechanisms which are carried thereby, and other organizations which are attached thereto. The body portion B is formed with a` pair of somewhat cylindrically shaped parts designated I0 and I I, each of which is vintended to receive a strainer element, as will be hereinafter described in detail.

' It is notable that each of these parts I0 and II of the casting may be Aprovided with threaded openings at I2 and I3, respectively, which openings ordinarily will be plugged up, as indicated at I4, when the unit' is used with a'bypass going" from'the pressure regulating valve back to the source of supply, However, only one of these openings I2 and I3 will be plugged up when the bypass is from the pressure regulating valve dlrectly back to this opening I2, which will be open,as shown at Figure 2.

"The main body portion B is open at the upper extremities of the parts I0 and I I, and seated on the upper edge of the parts Ill and II is a strainer carrying member designated I 5, which is shown in detail in Figure 3. This member I5 is provided with outer fiat ring-like anges I6 and I1 at each end, which are intended to rest on the upper edge of the circular parts Il) and II. Ccncentric with the ring-like parts I6 and I'I are downwardly depending flanges I8, which have anchored thereto a circular straining lelement shown at I9 in Figure 2. These strainer elements I3 are substantially cylindrical in formation, and when positioned in the circular parts IIJ and II of the main body portion B are spaced therefrom, as depicted in Figure 2.

Al cap member is referred to in its entirety by the reference character C, and is shown as clamped on the main body portion B by an arrangement comprising anges 20 on4 the body member B and ilanges 2| on the cap member C. These flanges 20 and 2I are provided with .openings, as shown at'22 in Figure 1, and headed screw bolts 23 pass through these openings and are screwed home to establish the clamped relationship.

It is notable that the cap member C is formed with an upwardly extending part designated 24. which is provided with a passageway that communicates with the interior of the main body part B, and a threaded socket at 26, which constitutes a means for connecting a uid supply conduit to the unit.

As shown in Figures 1 and 2, thisv cap member C may also be formed with threaded openings lat 2'I, each of which is substantially concentric With the cylindrical parts I0 and II, but under the conditions of usage illustrated in the drawings, these openings 21 will be closed by plugs, represented at 28.

Centrally-thereof the main body porti'on B is formed with a circularly shaped portion 23 that extends in a direction at right angles to the axis of the cylindrical parts I0 and II. This circularly shaped part 29 is reduced in diameter, as shown at 30 in Figures 1 and 4, and again reduced in diameterat 3|, which reduced portion 3I'is threaded, as illustrated in Figures 1 and 4. Extending 'throughout the central portion 29 is a circular opening or bore 32, which terminates at the shoulder indicated at 33. `From the shoulder 33 rearwardly is a circular passage 34, the axis of which is out of alignment with theaxis of the passageway 32. In other words, the circular passage 34 is eccentric to the passage 32.

'I'he wall of the central part 29 is formed with an opening 35, which is shown in Figure 2, and

. which establishes communication between the bore 32 and the hollow interior of the main body part B, which receives"the strainer elements I0 and II. Obviously fluid fuel in the hollow part B may pass through this opening 35 into the bore 32.

Another passageway designated 36 establishes communication between the bore' 32' and a pressure regulating valve, to be later described. It is notable that this passageway 36 extends through a ange 31, which constitutes a means for securing the pressure regulating valve in position on the main body part B.

An end closure for thebore 32 is shown at 38 as having an extension 39 which extends into the bore 32, vand snugly ilts'therein. This clo- -sure 38 may be secured in position on the main body part B by the headed screw bolts 48, which lindrical socketl 42, which is eccentric to the axis of. thebore 32, and the axis of which socket 42 constitutes a continuation of the axis of the passage 34. In other words, the .axes of the socket 42 and passage 34 are in alignment.

A bushing shown at 43 has an outer cylindrical surface which snugly receives the surface of the bore 32. It is notable that this bushing 43 is provided with a cylindrical bore 44, the axis of which is in alignment with the axes of the socket 42 and` passage 34.

A shaft referred to in its entirety' by the reference character S is shown asphaving one end received in the socket 42, whereby the latter is constituted a bearing for the shaft. lThis shaft S has an enlarged portion at 45 which is received in the bore 44 of the bushing 43, so that the bushing 43 constitutes a bearing for the shaft.

In order to prevent longitudinal movement of the shaft S the latter is formed with a flange at 48 which is received in a cut-away portion of the bushing 43, which is shown at 41. An end bushing designated 48 is -fitted in the end of the passage 34 within the reduced threaded portion .4|; this bushing 48 being provided with an end ange at 43 which engages thev end of the reduced threaded part 3|.

A cup member 50 has its inner cylindrical wall threaded, as shown at 5|, and which threaded wall .is screwed on to the threaded portion 4|. This cup member 58 has a bottom 52 formed with an opening 53, the axis of which is in alignp ment with the axis of thepassage 34. A bearing member 54 is received in a socket 55 which is formed in the bushing 48, and this bearing member' 54 has a lcentralbore 58 through which passes the shaft S.

A packing assembly is referred to in its entirety at P', and is eiective to provide a seal between the shaft S and the bushing 48. An

other packing assembly P1l provides a seal between the shaft S and the bushing 43. A coll spring shown at 51 extends between the packing assemblies P' and P2, respectively, and maintains these packing assemblies in eective position againstv these bushings. 48 and 43, respectively.

A similar arrangement for providing' seals at similar points in a rotary pump of the same type is 'clearly illustrated and described in the co-pending application of Walter Czarnecki, et.

driving relationship between the rotor 59 and shaft S being established by the key shown at 60. The rotor 59 has an outer cylindrical surface designated 8|, in which are cut a plurality of slots 62, the Aside walls of which are parallel to radii ofthe rotor, which radii extend between the walls of each slot 82.

Slidably received in each of the slots 82are blades 83, which extend at each end beyond the rotor 89. Disposed between the rotor 59 and closure 38 at one end is a ring member 84, which ring member is shown in detail in Figures 6 and 7. This ring member is duplicated at the other end of the rotor 59, and is positioned between the extremity of the rotor 59 and bushing 43. Each of the ring members 84 has an outer periphery l.85 which is snugly received in the bore'32, and' extending inwardly from this peripheral edgep are a plurality of slots- 88, which correspond to the slots- 82 in the rotor 59. However, it is notable that each of the slots88 is wider than the slot 82, and each of the slots 88 has side edges -which are parallel to radii of the 'bore 32, which radii extend betweenthe walls of the slot.

The blades 83 at each end extend into the slots 88, as shown in Figures -4 and 16, and `due to the slots 88 being wider than the blades 33.v a small 4amount of relative movement between the extremities of the blades in these slots 88 in the ring 84 is provided for. It is notable that each blade 83 latall times is in engagement with Vthe bore^32 on its outer edge. and the end pormost position with the ,edges ofthe blades 83 in engagement with the bore 32.

Due lto the eccentrlcity existing between the axes of the rotor and the bore 32 respectively the bore 32 will be effective to force the blades inwardly in 'the slots 82 incident to therotatlon of the rotor 59. K

Assuming that the rotor 59 is rotated in a counterclockwise direction with respect to the showing of Figure 2, it is notable that uid passing through the openings 35 will enter into the space between the rotor and the bore 32. The blades 83 being in their outermost positions with the edges engaging the bore 32 will affect -the iiuid to build up pressure4 therein as the shaft is rotated, so that fluid under increased pressure is delivered to the passageway 38.

This sliding movement of the vblades 83 in the slots 82- of the rotor 59 is accommodated by the breadth of the slots 88 in the rings 84; the action of the extremities of the blades in these slots88 of therlng 84 being brought out clearly f in Figure 16.

As the space between the bore 32 and' cylindrical surface 8| of thev rotor 53 decreases, speaking with reference to a counter-clockwise direction of the showing of Figures 15 and .16, the pressure on the'iiuid in this space will obviously increase, and at the same time the extremities of the blades 83 in the slots 88 will move from one wall of the slot over to the other, so at the time of maximum pressure on the fluid, which is just atA or prior to the time of being forced into the passage 36, the surface of the blade lwhich is forced against the fluid to build up the pressure will be in engagement with the sidewalls of the slots 88, as shown at 88 in `Figure-16.

While the blade and associated pump structure illustrated in Figures 2, 4, 6, 7, 15 and 16 '75 is designed with the blades and slots of a` rectangular cross sectional shape, it is not-essential that the blades 'be so formed.A It is notable that the term blades as used throughout the specification is intended to refer to blades of any shape having the required ability to affect the uld to build up pressure therein incident to rotation ent to their cylindrical formation and mounting, Y

which permits them to turn freely. As the rotor 59 is rotated, these cylindrical blades |35 will roll over the surface of the bore 32 with a minimum of resistance to turning 'of the rotor.

l Despite the presence of the packing assembly Pz a certain amount of the fluid fuel being operated' on by the pump may escape into the space defined by the passage 34. In order to provide for the return of this fluid to the bore 32, the bushing 43 is formed with a channel 58 which is inclined and opens at its upper end into the pumping chamber defined by the bore 32 and rotor 59. At its lower end the channel 43 opens into the space. defined by :the passage 34. As

the rotor 59 is rotated a certain amount of suction or partial vacuum is created to draw fluid from the passage 34 and pass it into the pump ing chamber of the bore 92.

A pressure regulating valve is shown in Fig- -ures 2 and 4 as constituting a part of the fuel supply unit, and is referred to generally by the reference character V. 'Ihe detailed .construction of the various parts. and mechanism of the pressure regulating valve are shown in Figures 8 to 13, inclusive.

Referring now-more particularly to Figure 8, the pressure regulating valve V is shown as lcomprising a main body portion in the form of a casing 69,- which is' of a hollow construction so as to house the various valve parts. At one end the casing 69 is provided with a threaded opening-designated V,10, and at the opposite end with another threaded opening designated 1|.

A passageway 12 is formed in a side wall of the casing 89, and constitutes a suitable continuation of the passageway 36 in the main body part B. The casing 89 may be provided with a flange at 13, through which extend openings 14 which accommodate headed bolts designated 15, shown more clearly in Figures 2 and 4. These bolts 15 are screwed into threaded openings in the flange 31, and serve to maintain the pressure regulating valve V assembled with the main body part B.

Screwed -into the threaded opening 10 is a plug member 16 formed with a threaded socket 11, which is designed to have connected thereto a suitable conduit which leads to the oil burner.

The plug member 18 is formed with an extension 18 extending into the hollow casing 69, and this plug member 18 is provided with a cylindrical socket`19 which slidably receives a valve member 80. The passageway 8l connects the socketsA 18 and 11, `and.establishes communication therebetween. Speakingv -with respect to the axis of I the socket 19, the walls of the extensions 18 are provided with a plurality of radially extending openings 82, which may be of any desired number, such as four in the illustrated embodiment.

The valve member 80 is formed with aconical tip 83, which when fitted'in the extremity of the passageway 8| serves to seal the same and cut off communication to the oil burner. However, when the valve member 80 has slid in the socket 19 to unseat the conical tip 83 from the extremity of the passage 8|, communication from the interior of the casing 69 through the passageway 82 to the passage 83 and socket 11 is established.

A piston element designated 84' is shown as slidable in acylindrical portion of the casing 69, which is designated`85. In order to establish a properly sealed connection `between the piston 84 and the cylindrical part 85 of the casing 89, a packing element is shown at 96 as being held in position by a ring 81 that may be pressed around a reduced cylindrical portion 88 of the piston.

Extending upwardly from the reduced portion 88 of the piston is a spherical projection 89 formed with a socket 90, which receives a ball 9| formed on the valve member 80. A coil spring, designated 92, engages the piston 84 at one end, and at the other end is received in a seat 93 formed in an end closure95 that is screwed into thethreaded opening 1|. It is evident that rthe spring 92 normally urges the piston 84 upwardly, and thus maintains the conical tip 83 of the valve member 80 seated in the valve seat defined by the end of the passage 8|. However, when sui'- ficient pressure has been built up in fluid within the casing 69 above the piston, the piston 84 may be moved against the influence of the spring 92 to unseat the conical tip 83 of the valve member 80.

JustA beneath .the spherical extension 90 the piston 84 is provided with a plurality of radially disposed passageways 96, which may be ofv any desired number, say for instance four. 'I'hese passageways 96 cross centrally of the piston,` andA communicating therewith is a central passage 91 thatopens into a cup-like depression 98 formed in the piston 84.

passage 91. Extending from the recess |0| into the interior oi' the housing 99 are a plurality of passages |02. 'I'he central part of the end structure |00 is formed with a recess |03, the edge of which constitutes a valve seat in a manner to be hereinafter described.`

A valve member |04 is slidably positioned in the housing 99, and at its upper end is formed with a truncated conical projection |05 which is provided with a cross cut or kerf designated |06. This cross cut or kerf opens on eachv side of the conical projection |05. The valve member |04 is provided with a central passageway |01 that communicates with the cross cut |06. A coil spring shown at |08'has one end fitted about a projection |09 formed on the valve member |94, and its lthe tension afforded by the spring |08.

When the valve. member |04 is urged upwardly by the 'spring |08 so that the truncated corneal other end is tted about a projection ||0 formed |03, the cross cut |06 will ,be almost, but not quite, entirely closed, providing just suiicient opening therethrough to'allow a so-called bleeding action, which is desirable in pressure valves of thisl type; the bleeding being to the bypass port identied at ||5. 'I'his bypass shown'at affected by the pressure to be moved against the iniluence of the spring |08, .to open up the communication between the passages |02 and |01, and thereby-insure of a proper bypassing of the fluid to the bypass port I5.

It is notable Athat the housing 99 movesY with the piston 84, and this housing 99 is formed with avshoulder at I|1 which serves to limit the movement of the piston 84. Obviously when the shoulder ||1 strikes against the edge of the bore ||8 formed in the end closure 95, further moveme'nt of the piston 84 is inhibited.

The bore 8 in the end closure95 is enlarged and threaded, as shown'at H9, and screwed thereinto is a cap member having a cup-like recess |2|l which accommodates the threaded stem ||2.

'I'lie housing 99 is provided with a plurality of openings |22, which establish communication between the interior of the casing 69, and thus to the bypass shown at ||5.

Referring now more particularly to Figures 11 and 12, a modified iorm of sliding valve is shown, which may take the place of the valve |04 shown in Figure 8. In this-modication the valve member |04 is replaced by a cup-like valve member |23 having a recess |24 which receives one end of the spring |08; the longer passage |01being replaced by the circular` passage |25.

When the pressure valve illustrated in Figure 8 is installed in a position which is' inverted from that shown, there may be a. tendency for sediment to collect at the passages 82. In order toavoid any possibility of such sediment collection interfering with the proper operation of the valve at the burner port, a somewhat modified form of valve may'be used at this point; such modication being shown at Figures 13 and 14. In thisform the extension 18 is not formed with the passages 82, but the socket 19 receives a valve member |26, the cylindrical walls of which are provided with a plurality of cuts |21, which establish communication between the interior of the casing 69 and passage 8|, when the valve member |26 is unseated from the valve seat dened by the passage 8|.

When the bypass line which is attached .to the socket ||6 extends back to the fuel supply tank, both the sockets |2 and I3 in the main body pa'rt B will be closed, as by the plug shown l. at I4. However, there is shown an arrangement in Figure 5 in which an elbow designated |28 is threaded into the socket ||6, while another elbow |29 is threaded into the socket |2.

Connecting the elbows |28 and |29 is a piece of tubing |30,"whlch is bent to the proper shape. It is evident that fluid bypassed through the port ||5 will be conducted through the elbow |28, tubing |30 and elbow |29, through the opening I2 into the main body part ofthe casing B. This compact arrangement obviates the n eed for pro- 'with the casing\wall 69, and extending thereviding a separate bypass line back to the source of fuel supply.

In Figures 22 and 23 there is developed a construction in which the structures of the casing y B. and casing -69 of the valve V are slightly modl- 5 fied to provide for a different form of bypass back to one of the strainer chambers.

It will be noted that the flange 31 of the casing B is formed with an ear |40 that is also integrally connected to the cylindrical part of the casing 10 B. This ear |40 is formed with a passageway |4| which extends from the face of the ear to the hollow interior of the casing part Il.

The wall of the valve casing 69 .is formed with a flange 13 through which extends the inlet passage 15 12. This flange 13 engages and cooperates with the iiange 31 to secure the valve V in position in the casing B, as above described. The flange 'I3 is formed with an extension |43 that is integral through is a passageway |44 that constitutes the bypass port of the valve V. 'Ihis passageway |44 is a continuation of the passage |4|, and establishes communication between the casing 69 of the valve V and the strainer chamber Referring now more particularly to Figures 17 to 20, inclusive, it is noted that the pressure regulating valve V is installed with the connection lntended to deliver fuel under proper pressure to the oil burner inthe lowermost position; this connection being ldentied at |3|. However, an important phase of the present invention is the adaptability of having this Apressure regulating valve V assembled in other dlierent relationships with respect to the remainder of the fuel supply unit. For instance, as shown in Figure 8, the pressure regulating valve V -ls in a vertical position,v but the connection |3| to the oil burner is disposed at the top .or in the uppermost position.

'I'he pressure regulating valve of this invention may also be eiectively installed in a horizontal position, as shown in Figures 19 and 20, and the connection |3| to the oil burnermay be positioned at' either side with respect to the remainder of the unit. 45

Figures 17 to 20, inclusive, show the pressure regulating valve V in alignment with the pump and when this arrangement is Vfollowed the lnternal construction of the valve casing and pump chamber is brought out in the sectional showing of Figure 21. This structure involves a considerable modiiicatlon in the structure of the casing I3 and valve casing 69.

It will be noted from Figure 21 that the end closure'38 is replaced by a somewhat similar structurev |45 formed as an integral part ofthe casing 69.. In addition to the socket 42 this structure |45 is formed with passageways |46 and |41, which constitute the bypass and inlet ports respectively of the valve V.

The casing B is formed with passages |48 and |49 that are continuations of the passageways |46 and |41, when the parts are assembled, and these passages |48 and |49 open into the'bore 32 in the manner illustrated. When the valve V is assembled on the casing B in the manner illustrated,

uid underbuilt up pressure will be introduced into the valve V from the pump in bore 32 through the conduit comprising passages |41 and |49, while iluld will be bypassed from the valve V directly back to the pump in bore 32 through the conduit defined by passages |46 and |48. When the pressure regulating valve V is to be installed horizontally rather than vertically it is merely necessary to relocate the passages |49|49. 75

will pass through the openings dened by the turned-down flanges Il into the strainers' I! and through the walls thereof into the space about the strainers in the niain body part B.

The strained uid will now pass through the opening into the bore I2, and due to rotation of the shaft S pressure will be built up on this fluid by the blades I3 impineing ther, and the fluid under increased pressure will be passed through the passages and 12 into'the interior of the casing 69 of the pressure regulating valve V.

When a required predetermined amount of pressure in the uid has been attained, the eifeot vof the spring $2 will be overcome'to move the piston ll and valve member Il to tmseat the conical tip 83 from the valve seat deiined by theI extremity of the passageway". The iluid, under a required degree of pressure, will then pass through the passages l2 and 8|, and through the connection III which is threadedin the socket 11 to the oil burner.

If pressure on the uidcontinues to build up,

the eect of the spring Ill will also be overcome, and the valve I will be moved to unseat the truncated conical tip III from the valve seat |03, Y

and iluid will pass through the es 96, Si,

IIII, |02, |01 and openings |22 to the bypass port Ils. From the bypass .port the nula wm either go back to the vsource oi fuel supply, or be bypassed directly to the opening I2 in the B,asshowninFlgure5. 1

While preferred speciilc embodiments of the invention are hereinbefor'e set forth, it is to be clearly understood that Iam not to be limited to the exact constructions illustrated and described,-

because various modifications of these details may be provided in putting thelnvention into practice within the purview of the appended claims'.

I claim:

mainbodypartV l. A fuel supply unit of the character described comprising a main body part having a central portion formed with a bore, pumping instrumentalities housed in said.v bore, a cap member, a strainer carrier clamped betweenthe cap member and the main body part, straining elements carried by said carrier and extending into the main body part of the casing, there being a strainer disposed on each side of the said -central portion; there being an opening establishing the communication from the main body part of the casing to thebore in the central part thereof, and a pressure regulating valve attached to the main body part, there being passages establishing communication between said bore and the pressure regulating valve.

2. A fuel supply unit of the character described comprising a main body Dart having a central portion formed with a bore, a rotary pump housed in said bore, there being an opening in one wall of the central part for admitting uid to the rotary pump to have pressure built up therein, a strainer organization carried by the main body part and providing a strainer on each side of the rotary pump, and a pressure regulating valve ailixed to said main body part, there being a passageway extending from said bore to the inlet port of the pressure regulating valve.

3. A ful supply unit of the character described comprising a main body Dart formed lwith two circular portions, one on each side, and a circular central portion disposed between the said iirst mentioned circular portion, the axis of which extends at right angles to the axes of the side circular parts, said central portion being formed with a passageway establishing communication between said central portionand one of the side portions, straining elements disposed in said side circular parts, said straining elements being carried by a strainer carrier, a cap member, said carrier member being clamped between the cap member and the'main body part, a rotary pump in said central circular part, a pressure regulating valve aiilxed to the main body part, and means for conducting fluid from the central circular part to the pressure regulating valve.

WALTER CZARNECKI. 

